Automotive jack



May 21, 1935. 2 B BLAC 2,002,428

' AUTOMOTIVE JACK Filed Sept. 8, 1931 DEM 11M! 51, Hex

INYENTOR ATTOR NEY Patented May 21, 1935 UNITED STATES PATENT OFFICE I p2,002,428" 3 l AUTOMOTIVE JACK V Benjamin Black, Brooklyn, N. Y. YApplication September 8, 1931, Serial No. 561,738 I 9 .1 Claim. (01.254-86) The object of the invention is to provide a jack for use inconnection with vehicles to be carried by the latter as a permanent partof the equipment; to provide a jack ofthis character which is swingableinto a position of non-use from which it may be extended to operativeposition and made to subsequently effect elevation of the vehicle, theelevating action following the lowering movement in the operation of theactuating means alone; to provide a jack which will positively maintainits inoperative position; to provide a device of this character whichwill positively maintain its extended position; and to provide a jack ofthe character described which is of comparatively simple form andsusceptible of cheap manufacture.

With this object in view, the invention consists in a construction andcombination of parts, of which a preferred embodiment is illustrated inthe accompanying drawing, wherein:

Fig. 1 is an elevational view of the invention shown in extendedposition.

Fig. 2 is a view similar to Fig. 1, but looking in a direction at rightangles to that in which the latter figure is viewed, parts being brokenaway in this figure.

Fig. 3 is a side elevational view, looking in a direction in which Fig.2 is viewed, but showing the jack in inoperative position.

Fig. 4 is a perspective view showing the head portion of the jack whenin the inoperative position.

The jack proper comprises an extensible leg composed of the telescopingsections l and II of which the latter is in surrounding relation to theformer and is keyed to the same as indicated at l2 to preclude relativeangular movement of the sections, said key l2 being slidably engaged ina groove or slot ll formed in the outer wall of the section H).

The key or feather I2 is carried in the upper or collar portion l5 ofthe section II and this collar provides a shoulder against which one endof the compression spring l6 bears, the compression spring being insurrounding relation to the section II and compressed between the collarportion l5 and a follower ring l1, surrounding the section II butslidably mounted thereon.

The sections are extended by the admission of a fluid to the same, bothsections being hollow for the reception of the fiuid and as this isforced into the section II], it gradually forces the section I ldownwardly until the foot l8 bears on the surface, when continuedextension will result in raising the load is' attached. V

Preferably the fiuid employed is inelastic and a conventional hydraulicpump is employed to force it into'the section ID at the upper end of thelatter through the nipple l9 which is connected to the section II) andto a feed hose 20 connected with the pump. I

The follower ring I! is provided with an upstanding arm 2| to which isconnectedthe lifting arm 22, the latter comprising the sections 22a and22b hingedly connected together as at 23, a torsional spring 24, beingmounted to the hinged connection and engaged with the sections to causethe latter to fold down into parallelism with each other as indicated inFig. 3. The arm section 2212 is pivotally connected as indicated at 25with'the follower ring arm 2i, while the arm section 22a is pivotallyconnected as indicated at 26 with the hanger plate 21, the latter beingdesigned for attachment to any convenient part of the vehicle to whichit may be secured by means of fasteners, or by welding, or in any otheraccessible manner. In the illustrated embodiment, the hanger plate issecured to a bracket plate 28 constituting an extension of the clampmember 29, the latter straddling the channel 30 of the chassis frame towhich it is secured by the clamp plate 3| and the nuts 32 engaging screwstuds 33 constituting integral parts of the clamp member 29.

The lifting leg comprising the sections Ill and l I, is hingedlyconnected to the hanger plate, as indicated at 34, by means of a capplate 35 to which the section III is connected at the upper end of thelatter. By means of this construction, the lifting leg may swing into aposition of parallelism with the hanger plate or into a position ofperpendicularity with respect to the latter. In this latter position,the cap plate lies snug against the under-face of the hanger plate andthis position is positively insured by means of a latch loop 36,hingedly mounted as at 31, to the free end of the cap plate. A torsionalspring 38, mounted at the hinge connection 31, tends to swing the latchloop to a position at right angles with the cap plate, as indicated inFig. 2, when the latch will pass over the tongue 39 constituting anintegral extension of the hanger plate. The latch loop is released fromits engaged position with the tongue by means of a finger 40 carried bythe to which the section lo 7 section II of the jack leg, so that whenthe latter arm 42formed at its upper end with a lateral finger 43. Inthe retracted position of the section- II, this finger engages in a camslot 44 formed in the under-edge of a block 45 carried by the hangerplate, preferably as an integral part thereof, the finger lying in thisslot during the swinging movement of the jacking leg to inoperativeposition, after which it passes from the slot under the horizontal edge41 to positively maintain the folded position of the jacking leg. I t

In the operation of the invention, with the parts inoperative positionas indicated in Fig. 3, the pump is actuated so that fluid is forcedinto the telescoping sections comprising the jacking leg. This firstresults in a movement of the section I l against the pressure of thespring l6 until the finger 43 shall have passed from the lower edge 41of the block 45 into said slot 44. The continued application of fluid bythe pinup results in further extending the section ll, butthe spring l6bearing on the follower ring l1, tends to unfold the arm sections 220.and 2212, with the result that the jacking leg is swung down to verticalposition by reason of the unfolding operation of the arm 22. V Thecontinued operation of the pump results in further extending the sectionII, this further extension being permitted by the compression of thespring 16, as the jacl; leg will have reached its vertical position withthe cap plate engaging the under-face of the hanger plate 21. Theextension of the section II moves the finger 49 out of obstructingrelation with the lug 4 l, so that the spring 38 functions to shift thelatch loop into a right anguiar position with respect to the cap plate,permit ing. it to yield laterally when the rounded edge 49 engages thetongue 39 and subsequently swing over said tongue. dicular position ofthe jack leg, elevation of the load is effected by continued actuationof the pump to further extend section II.

After use, when it is desired to return the jack into inoperative orfolded position, the valve on the pump is actuated to permit the backflow of the fluid, when the spring l6 first functions to slide thesection H back over the section Hi, When the finger iil engages the lug4| thus releasing the latch loop 36' from the tongue 39. During thisaction the compression spring I6 is permitted to expand, thereby movingmember 21 to its lowermost position relative to the section ll of thejack, thus maintaining the angular separation of arms 22b and 22a. Thenthe torsional spring 24 on the lifting arm may function to fold the armsections into parallelism with each other and thereby swing the jackingleg laterally and upwardly toward the vehicle body.

What claimed as new, is:

A vehicle jack including an extensible lifting leg having a swingingconnection withthe ve- "nicle and means for first partially extendingthe leg while the latter is in elevated position and. for then loweringthe leg to a vertical position and then further extending it, said meanscornprising a fluid under pressure within said leg, and a jointed armcomposed of pivotally connected sections of which one is terminallyconnected with a section of the lifting leg and the other with a fixedpart of the vehicle, and spring means compressed during the partialextension of the leg and adapted to contract the leg when the fluidpressure is released.

BENJAMIN BLACK.

In the latched perpen-

